That's quite a problem. You tend to get those by dividing things into black and white like that. I've known quite a few smart people that just still don't care about English being imperfect, and I've met a few dumb ones that care greatly about details like word choice and ignore the conversation to focus on errors.

Splitting the world between "people who do a thing you agree with" and "morons" is a choice, but its one I try to avoid as a rule.